Make sure there's enough room in the case for the card's large cooler. Otherwise, good choice.
I have an MSI NX8400GS - TD512EH in there now. I had to cut about 1" of the cooling fin off the back of the card to clear the fan housing on the CPU cooling fan, but it didn't affect the card.
OK, so I'm off to buy the GT-520 card. Here's hoping....
Thanks for your help.